I recently downloaded a DSL iso file. I loaded the iso in VirtualBox and it worked perfectly, but when I wrote the iso to a CD using k3b and I tried booting it, I got an error. I tried booting from the disk in VirtualBox and got the same error. "FATAL: Could not read from the boot medium! System halted." Does anyone know of an iso that they downloaded that worked for them?

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If you could boot the image without problems but can't boot the image written to disk, there's probably been an error writing the image.
Try again using a lower writing speed and verify the disc after writing.

how did you burn the ISO? If you burned it, as some people do, as a file on a CD it will not work. You must burn the CD as a "From image" type. If you were to mount the CD, what are the contents?

Last time I used the lowest writing speed available (4x) but I didn't check it. I'll try re-burning. Thanks.